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TECHNICAL REFERENCE LIBRARY
Crossover Cable

This document shows how to properly construct a Crossover (or MBIX) network cable. This cable can be used to cascade hubs, for connecting two Ethernet stations back-to-back without a hub, or connecting two CSU/DSU's back to back for testing Wide Area Network (WAN) configuration. This crossover cable will work for 10BASE-T & 100BASE-TX. NOTE: You cannot use crossover cables on 100BASE-T4 devices. Use Category 5 unshielded twisted-pair (UTP) cable. The maximum cable distance between the port and the attached device is 100 meters (328 feet), including all patch cables, panels, and connectors.

Pin Colors on one end of MBIX Cable Colors on other end of MBIX Cable
1 White/Orange          (TD+) White/Green          (RD+)
2 Orange/White          (TD-) Green/White          (RD-)
3 White/Green            (RD+) White/Orange        (TD+)
4 Blue/White              (N/A) Blue/White              (N/A)
5 White/Blue              (N/A) White/Blue              (N/A)
6 Green/White            (RD-) Orange/White        (RD+)
7 White/Brown          (N/A) White/Brown          (N/A)
8 Brown/White          (N/A) Brown/White          (N/A)

RJ-45 PLUG RJ-45 PLUG UTP PAIR COLORS:
    PAIR 1 - BLUE
    PAIR 2 - ORANGE
    PAIR 3 - GREEN
    PAIR 4 - BROWN
Category 5 wiring standards:

EIA/TIA 568A/568B and AT&T 258A define the wiring standards and allow for two different wiring color codes.
Pin # EIA/TIA 568A AT&T 258A, or EIA/TIA 568B Ethernet 10BASE-T Token Ring FDDI, ATM, and TP-PMD
1 White/Green White/Orange X   X
2 Green/White Orange/White X   X
3 White/Orange White/Green X X  
4 Blue/White Blue/White   X  
5 White/Blue White/Blue   X  
6 Orange/White Green/White X X  
7 White/Brown White/Brown     X
8 Brown/White Brown/White     X

  • Pairs may be solid colors and not have the stripe.
  • Category 5 cable must use Category 5 rated connectors.
  • Use plenum cable where applicable.
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Page last modified on: Wednesday February 27, 2002 at 14:39